Damper control



Sept. 1, 1925. 1,552,100

S. B. WATERS DAMPER CONTROL 1 ed Dec. 11,, 1923 nililliw Patented Sept.1, 1925.

UNITED STATES S MU L B- WA E S, T N, FENNSYLV NI DAMPER CONTROL.

Appli ation filed Dec mber .11, 1923- Stria-l No. 679,921.

, To all whom it may concern:

Be it known that I, SAMUEL B. VVATnRs,

a citizen of the United States, residing at J ohnstown, county ofGambria, State of Pennsylvania, have invented a new and usefulImprovement in Damper Controls, of which the following is a full, clear,and exact description. This invention relates to damper control andparticularly to an improved device for effecting operation of a damperin a predetermined time.

In firing a house-heating boiler or the like, it is desirable to supplyadditional air to the combustion chamber until the volatile matter isburned from the coal, after which the air supply should be reduced foreconomical' combustion. The time usually required to burn the volatilematter is about twenty minutes, but this time will of course vary, andprovision is made for regulating the closing of the damper in anydesired time interval.

I provide a damper control having a liquid chamber of variable volume, aconnection with the damper'to be controlled movable in accordance withvariations in the chamber volume, and a liquid connection to the chamberhaving means offering greater resistance to flow in one direction thanin the other. Preferably, the apparatus comprises a liquid reservoirwith a chamber therebelow and a liquid conduit between the reservoir andthe chamber. This conduit is provided with a check valveso that thechamber may be readily increased in volume as the damper is manuallyopened, after which the valve seats and the closing of the damper iscontrolled by the increased resistance to the return of the liquid fromthe chamber to the reservoir. It is desirable to provide a variableresistance, such as a needle valve, together with a sight feed, so thatthe timing of the damper control may be readily adjusted.

In the accompanying drawings illustrating the present preferredembodimentof the invention- Figure 1 is a side elevation, partly brokenaway, of a damper control embodying my invention;

Figure 2 is a section on the line IIII of Figure 1; and 7 Figure 3 is asection on the line IIIIII of Figure 2.

In the illustrated embodiment of the in* vention, there is shown an airconduit 2 connected to a furnace (not shown) and having therein adamper3 of usual construction. This damper is provided with a lever 4connected to a hand lever 5 by a chain 6. The hand lever 5 is pivoted at7 and is, provided with a counter-weight 8 I tending to move the damperto closed position, as shown in Figure 1.

The lever 5 is further provided with a handle 9 for opening the damper.When the furnace is fired with a fresh charge of coal, the handle 9 ispulled downwardly, thus opening the damper and providing ad ditional airfor the combustion chamber of the furnace.

Bearing on the lever 5 adjacent the pivot 7 is a finger 10 connected tothe bottom of an eXpa-nsible diaphragm chamber 11. Immediately above thechamber 11 is areservoir 12 filled with a suitable liquid, such as oil,and connected to the chamber 11 by a conduit 13. A check valve 14: isprovided at the upper end of the conduit 13, whereby liquid may enterthe chamber 11 through an opening 15, as the handle 9 is pulleddownwardly.

When the handle 9 is released, the counterweight 8 tends to return thedamper to closed position, but in order to do so it must decrease thevolume of the chamber 11 by forcing oil therefrom into the reservoir12.- The check valve 14: closes on this stroke and the oil takes a paththrough the conduit 13 and a conduit 16 having a needle valve 17therein. The needle valve 17 is preferably provided with a sight opening18, so that the rate at which the oil is returned to the reservoir maybe readily noted.

The entire apparatus may be attached to the ceiling, a rafter or othersuitable support by spacer bars 19 terminating in an attachment plate20.

It will be seen that when the handle 9 is pulled downwardly, the oilwill flow freely through the check valve 14 and fill the liq uid chamber11, while on the up stroke, the oil must take the more restricted paththrough the needle valve 17, and that by regulating this valve, the timerequired to close the damper may be readily adjusted as desired.

I provide a simple and effective means for controlling a damper, wherebythe efficiency of the furnace may be greatly increased withoutinconvenience on the part of the the preferred embodiment of theinvention,

' rection than it will be understood that it is not limited thereto, butmay be otherwise embodied within the scope of the following claims.

I claim:

1. A damper control, including a liquid reservoir, a chamber of variablevolume adapted to draw liquid from the reservoir only, the reservoirbeing of greater volume than the displacement volume of the chamber, ann t en w th th d p o b 0 trol led movable with variations in thechamber volume, and' a liquid conduit'between the reservoir and thechamber having means offering a greater resistance .to flow in one di- Hin the other, substantially as desr be 2.- YA dampe entr i clu ng a iqreservoir, a chamber of variable volume adapted to dra liquid fr m treservoir e ly, the rese o being of at r volume than the displacementvolume of the chambem .cee ee ion w th th amp torbe 0 troll'ed movablewith variations in the chamber volume, a check valve for permittingsubstantiallyunrestricted flow from the reservoir to the chamber, and anadjustable valve for permitting restricted flow from the chamber to thereservoir, substantially as described.

3. A dampercontro'l, including a fluid reservoir, a chamber of variablevolume, a connection with the damper to be controlled movable withvariations in the chamber volume, a check valve for permittingsubstantially unobstructed flow from the reservoir to the chamber,adjustable means permitting a restricted flow from the chamber to thereservoir, and a sight feed whereby the rate of flow from the chamber tothe reservoir may be readily ascertained, substantially as described.

4. A damper control, including a reservoir, a chamber of variable volumetherebelow, a connection with the damper to be controlled movabie withvariations in the chamber volume, non-return means permitting free flowfrom the reservoir to the chamber, a conduit for return flow from thechamber to the reservoir, said conduit terminating above the liquidlevel in the chamber, and a sight glass in the conduit above the liquidlevel in the chamber, substantially as described.

In testimony whereof I have hereunto set my hand.

SAMUEL B; WATERS,

